Final answer:
The Ramachandran plot is used to analyze dihedral angles in protein structures by displaying the possible phi and psi angles for amino acid residues.
Step-by-step explanation:
The type of plot that is commonly used to analyze dihedral angles is the Ramachandran plot. Unlike a line plot, scatter plot, or bar graph, the Ramachandran plot specifically visualizes the phi (φ) and psi (ψ) dihedral angles that are possible for amino acid residues in a protein structure. It is a crucial tool for understanding protein folding and conformation since it helps in identifying the feasible angles that a protein's backbone can attain, which is critical for the protein's three-dimensional shape.